+/* taint.c
+ *
+ * Copyright (C) 1993, 1994, 1995, 1996, 1997, 1998, 1999,
+ * 2000, 2001, 2002, by Larry Wall and others
+ *
+ * You may distribute under the terms of either the GNU General Public
+ * License or the Artistic License, as specified in the README file.
+ *
+ */
+
/*
* "...we will have peace, when you and all your works have perished--and
* the works of your dark master to whom you would deliver us. You are a
* liar, Saruman, and a corrupter of men's hearts." --Theoden
*/
+/* This file contains a few functions for handling data tainting in Perl
+ */
+
#include "EXTERN.h"
+#define PERL_IN_TAINT_C
#include "perl.h"
void
-taint_proper(const char *f, char *s)
+Perl_taint_proper(pTHX_ const char *f, const char *s)
{
- dTHR; /* just for taint */
char *ug;
- DEBUG_u(PerlIO_printf(Perl_debug_log,
- "%s %d %d %d\n", s, PL_tainted, PL_uid, PL_euid));
+#if defined(HAS_SETEUID) && defined(DEBUGGING)
+# if Uid_t_size == 1
+ {
+ UV uid = PL_uid;
+ UV euid = PL_euid;
+
+ DEBUG_u(PerlIO_printf(Perl_debug_log,
+ "%s %d %"UVuf" %"UVuf"\n",
+ s, PL_tainted, uid, euid));
+ }
+# else
+ {
+ IV uid = PL_uid;
+ IV euid = PL_euid;
+
+ DEBUG_u(PerlIO_printf(Perl_debug_log,
+ "%s %d %"IVdf" %"IVdf"\n",
+ s, PL_tainted, uid, euid));
+ }
+# endif
+#endif
if (PL_tainted) {
if (!f)
ug = " while running setuid";
else if (PL_egid != PL_gid)
ug = " while running setgid";
- else
+ else if (PL_taint_warn)
+ ug = " while running with -t switch";
+ else
ug = " while running with -T switch";
- if (!PL_unsafe)
- croak(f, s, ug);
- else if (ckWARN(WARN_TAINT))
- warner(WARN_TAINT, f, s, ug);
+ if (PL_unsafe || PL_taint_warn) {
+ if(ckWARN(WARN_TAINT))
+ Perl_warner(aTHX_ packWARN(WARN_TAINT), f, s, ug);
+ }
+ else {
+ Perl_croak(aTHX_ f, s, ug);
+ }
}
}
void
-taint_env(void)
+Perl_taint_env(pTHX)
{
SV** svp;
MAGIC* mg;
NULL
};
+ /* Don't bother if there's no *ENV glob */
if (!PL_envgv)
return;
+ /* If there's no %ENV hash of if it's not magical, croak, because
+ * it probably doesn't reflect the actual environment */
+ if (!GvHV(PL_envgv) || !(SvRMAGICAL(GvHV(PL_envgv))
+ && mg_find((SV*)GvHV(PL_envgv), PERL_MAGIC_env))) {
+ bool was_tainted = PL_tainted;
+ char *name = GvENAME(PL_envgv);
+ PL_tainted = TRUE;
+ if (strEQ(name,"ENV"))
+ /* hash alias */
+ taint_proper("%%ENV is aliased to %s%s", "another variable");
+ else
+ /* glob alias: report it in the error message */
+ taint_proper("%%ENV is aliased to %%%s%s", name);
+ /* this statement is reached under -t or -U */
+ PL_tainted = was_tainted;
+ }
#ifdef VMS
{
if (!svp || *svp == &PL_sv_undef)
break;
if (SvTAINTED(*svp)) {
- dTHR;
TAINT;
taint_proper("Insecure %s%s", "$ENV{DCL$PATH}");
}
- if ((mg = mg_find(*svp, 'e')) && MgTAINTEDDIR(mg)) {
- dTHR;
+ if ((mg = mg_find(*svp, PERL_MAGIC_envelem)) && MgTAINTEDDIR(mg)) {
TAINT;
taint_proper("Insecure directory in %s%s", "$ENV{DCL$PATH}");
}
svp = hv_fetch(GvHVn(PL_envgv),"PATH",4,FALSE);
if (svp && *svp) {
if (SvTAINTED(*svp)) {
- dTHR;
TAINT;
taint_proper("Insecure %s%s", "$ENV{PATH}");
}
- if ((mg = mg_find(*svp, 'e')) && MgTAINTEDDIR(mg)) {
- dTHR;
+ if ((mg = mg_find(*svp, PERL_MAGIC_envelem)) && MgTAINTEDDIR(mg)) {
TAINT;
taint_proper("Insecure directory in %s%s", "$ENV{PATH}");
}
/* tainted $TERM is okay if it contains no metachars */
svp = hv_fetch(GvHVn(PL_envgv),"TERM",4,FALSE);
if (svp && *svp && SvTAINTED(*svp)) {
- dTHR; /* just for taint */
STRLEN n_a;
bool was_tainted = PL_tainted;
char *t = SvPV(*svp, n_a);
PL_tainted = was_tainted;
if (t < e && isALNUM(*t))
t++;
- while (t < e && (isALNUM(*t) || *t == '-' || *t == ':'))
+ while (t < e && (isALNUM(*t) || strchr("-_.+", *t)))
t++;
if (t < e) {
TAINT;
for (e = misc_env; *e; e++) {
svp = hv_fetch(GvHVn(PL_envgv), *e, strlen(*e), FALSE);
if (svp && *svp != &PL_sv_undef && SvTAINTED(*svp)) {
- dTHR; /* just for taint */
TAINT;
taint_proper("Insecure $ENV{%s}%s", *e);
}